Progress in instruments and equipment: 1960

Francis, Howard J.; Hetherington, Joseph F.

doi:10.1016/0026-265x(61)90013-3

Cited by 3 publications

(1 citation statement)

References 92 publications

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“…To the texts already referred to on instrumentation (112,207,329,342), three others should be listed (22,103,383), as well as an interesting discussion on the automatic determination of clinically important steroids (256), on automatic refractometers (252), and on new instruments for the determination of carbon and hydrogen (254) Progress in instruments and equipment for microanalytieal work was reviewed (129). Automation developed for the study of continuous reactions by refractive index measurements (356), for automatically recording melting points (27), for titration of chloride in biological fluids (91), and for recording excitation spectra (330) was reported.…”

Section: Instrumentation and Automationmentioning

confidence: 99%

Biochemical Analysis

Hamilton¹

1962

Anal. Chem.

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Section: Instrumentation and Automationmentioning

confidence: 99%

Biochemical Analysis

Hamilton¹

1962

Anal. Chem.

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Evaluation of an Automatic Nitrogen Analyzer for Tractable and Refractory Compounds.

Sternglanz¹,

Kollig²

1962

Anal. Chem.

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If the acidity of the solution is too high, the amine is also protonated to a great extent and cannot add to the protonated aldehyde. If the acid concentration is too low, not enough of the aldehyde is protonated to cause a significant rate of addition of the amine.Samples of n-butylamine mixed with equimolar quantities of di-n-butylamine, tri-n-butylamine, and ammonia were titrated according to this procedure, and no interference due to the presence of these added bases was noticed. The results of the titration of the above mixtures were all within two standard deviations of the mean of the results of n-butylamine alone.Repeated attempts were made to titrate primary aliphatic amines in the presence of primary aromatic amines without success. Although the aromatic amines do not react appreciably with %ethylhexanal under the reaction conditions employed for the titration, the intrinsic ultraviolet absorbance of the aromatic amines a t 305 mp causes the absorbance of the solution being titrated to be so great that the relative change in absorbance during titration is very small. A number of aromatic aldehydes were tried as titrants, but none of these reacted rapidly enough with the aliphatic amines to make a practical titration possible.Crotonaldehyde, Lvhose carbonyl absorption peak is a t 325 mp instead of 295 mM, was also tried as a titrant, but unfortunately crotonaldehyde reacts to a significant extent with many aromatic amines while reacting only slowly with most aliphatic amines. Thus, the procedure reported can tolerate the presence of only a small amount of an aromatic amine or any other substance whose intrinsic absorbance at 305 mp is high.

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Use of Differential Reaction Rates to Analyze Mixtures of Organic Materials Containing the Same Functional Group. Application to Mixtures of Amines.

Hanna¹,

Siggia²

1962

Anal. Chem.

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Progress in instruments and equipment: 1960

Cited by 3 publications

References 92 publications

Biochemical Analysis

Biochemical Analysis

Evaluation of an Automatic Nitrogen Analyzer for Tractable and Refractory Compounds.

Use of Differential Reaction Rates to Analyze Mixtures of Organic Materials Containing the Same Functional Group. Application to Mixtures of Amines.

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